Drilling machine



Nov. 22, 1932. A HOSSFELD 1,888,668

DRILLING MACHINE Filed Dec. 4. 1951 l2 sheets-sheet 1 lmr Y lia u J Y..

Patented Nov.) 224,` V1932 ALBERT HossFELD, or wINoNA, Mnvivns'ora- DRILLING MACHINE Application flied December 4, 193i. serial No. 578,883.

l'My present invention relates to a drilling machine 'of the type disclosed and broadly claimed in my United VStates-patent, Drilling machines,7 Number 1,127,003 issued Feb- '5 ruary 2, 19,15.

This invention provides a self-contained junit which includes a motorand transmission mechanism for reciprocating-a sliding .i carriage on which a drill or Vother tool is inlo dependently reciprocated `in respect thereto.

This unit is designed to withstand the severe shocks, strainsY and vibrations commonV to such machines and atthe same time belight i enough in weight to be easily carried or trans- 415 ported-and very `quickly setup for each hole to be drilled or operation to be performed and adjusted for such work to operate the tool in either a vertical or horizontal position v or at any angle-between these two positions. lThe design of the machine also permits it to be positioned so that its cutting tool may be operated very close to aV wall, ledge or the like.

The invention further provides novel means for mounting the drill for compound reciprocatory and rotary movements, whereby it is relieved from all side pressure and further provides novel` means vfor mounting other strains caused by vibrations, etc. j

Further objects of this invention `are to overcome certain serious objections in the construction of the machine shown in the patent heretofore referred to, to Wit: Themounting of the carriage on the frame, the mounting of the drill on the carriage, and the application of power for reciprocating the carriage which is off-center or, in other words, is'at a point radially offset from the axis of the drill and midway between the bearings on the car- 40 riage for the drill. This mounting of the carriage and the drill andV theoE-center application of power producesangular movements to the carriage duringf its reeiprocatory movement in respect to the longitudinal axis of the drill. that cause a side thrustpressure of the carriage against the drill at diametrically opposite and longitudinally spaced points. This lateral pressureon the drill by the carriage produces aigripping action that '50 prevents free and-easy rotation ofthe vdrill 4by vibrations when `it is working in a vertithesame i,

Furthermore, the off-center application of and requires considerable. power to overcome powerfto the carriage produced a whipping 1 action'on the outer end portion `of the drill, during its. reciprocatory movement, thatinake it` extremely diflicult to `keep the machine standing steady even by the use: of heavy retainingweights." fl f Another objectionto my prior machine was that the llower guide for the carriage,-v in whichthe d'rill worked, was necessarily`v close, to the work and'constantly withinrangeof the splash from the cuttings of the rock a result that-it was difficult to keep the beary ing properly lubricatedjand` the side thrust i ofthis bearing on the drillcaused rapid wear.

In my present invention the carriage and drill are mounted vfor independent reciprocatory movement in the same plane' andthe application .of power for reciprocating the carriage isfevenlyrdistributed `on the carriage Y so thatit is in a direct line with the move-VV ment of the carriage, thus eliminating` all side pressure on the drillandv the carriage on its guides. i j j y The carriageinhe present application the same on its guides and 'in mounting the drill on the carriage at its tool-equippedend, whereby the drill is relieved from all side thrust from the carriage, even to that vof iassisting in carrying thev weight of the drill when operated ineitherahorizontal orv an obliqueposition,.or other side strains caused cal position. This mounting,` of the toolequipped ,end of the drill doesnot require a lubricant and reduces wear to a minimum.

Other objects of the invention will appear in the followingy description.

To the above end, generally stated, the invention Consists of the novel devices and combinations'of devices hereinafter described and defined in the claims.`

In the accompanying drawings, which illustrate the inventionflike characters indicate like parts throughout the several views.

Referringtothe drawings :i

F ig.- l is a perspective 'view Vof the im- 37100 f6; rectangle and comprisesV a Pair "0f long* vthe drill projected;

viewY partlyv in elevation and Fig. 3 is a vpartly in vertical section taken onrthe line 3-3 of Fig. 2;

Fig. 4 is a perspective View of the drilling machine with some parts removed andl other .parts brokenaway and looking at the machine from the back thereof with the parts horizontalA hole when the wheels positioned as shown in Figs. 2 and 3; Y

Fig. 5 is a perspective view of the machine principally L,in .diagram a-nd looking-at the:

the right side thereofY and ad- .justed for'transportation orV for ldrilling a are adjusted same from as shown Vby broken lines;

Fig. 6 is a ViewV partly 1n y Fig. y7 is a View partlyl in plan and partly .inhorizontal section taken on VVthejline 7-7 Vof Fig. 1.;

`- Fig.8 is a fragmentary detaill view with f someiparts sectioned on the line 8-8 of .Fig.,7, on an enlarged scale;

Fig. 9 isv'a' fragmentarydetail view with 'some parts sectioned onthe line 9-*9 of Fig. 1, on an enlarged scale;

- Fig 10 is a detail view'with some partsv sectioned on theline 10-10 of Fig. l, on an Aenlarged scale;

' Fig. 11- is a sectioned on the line 11-11 of Fig. l, on an "enlarged scale;

Fig. 12 is a fragmentary detail View with some parts Vsectioned on the line12e-12y of Y Fig.'1, onr an enlarged scale;

` Fig. 13 1s a perspective'view lof -thevchain y, Asectioned on the line'1'5-15 Vtightener for they crank-shaft drive;

" Fig;Y '14 is a detail View withsome parts sectioned on the line 14e-'111 of Fig. 13; l Fig-.15 isV adetail View withsome Vparts of Fig. 4, on an enlarged` scale; and l j Fig. j sectioned on the line -16-16 of Fig. 5.

The'numeral 17 indicates a 'of which vis a lon'ground steel bar having 'on its inner endv acutter 18. l This drill 17 is mounted on a'reeiprocatory carriage 19 for compound endwis'e reciprocatory movement and rotary movement'about itslongitudinalA axis. on a tilting frame 2O vfor sliding movement longitudinally thereof and `said tilting frame, inV turn, is mounted von a main`or stationaryfhorizontal frame 21'.` n

` 5 VV*villain frame Thermain iframe 21 is in the formof .a

bottom plan and partly in horizontalseetion taken' on theline 6 6 of- Fig.A 1;VA

l Y Y `legs 26'may 16 is a 'detailvview with'soniev parts drill the bodyV The carriage Y 19 is .mounted vthereof is a single supporting arm-23. All

of the members of the frame 21 and the arm 23 are tubular which make a strong rigid structure that is of relatively lightweight. The arms 227 which are parallel to the 'end members of thel frame V21,V are formed by the -end portions of the side members of saidv frame. `In forming the arms 22 the side members `of the frame 21 are extended in parallel arrangement forward ofl theffront end member of said frame toI form alrecess24, for a purpose that -will presentlyappear, and then'laterally,` outward of-thefframe 21 to form .said arms.` y 'Y The arm 23'is Welded otherwise rigidly secured tothe rear end member of the frame Y' 21,]at the longitudinal Ycenter thereof, and,

projects rearward therefrom lin theplane of Y' said frame.l The end portions ofthe rear end member ofthe framei21 are extended of arms 25. I

90. outward of theframe 21 and alfor'da pair Each of the arms 22rv and .the armi23 is providedwith a ground-engagingleg 26 in' the form`V of a roundibar of iron pointed at its lower end. These legs 26 extend lthrough vertical'holes inthe arms l22 and/.23 with freedom for endwise slidingmo-vement vfor Y adjustment to supportithe main `frame 21 with avthree-point contact. Eye bolts 27'are Varms 22 and 28 and through holes fin'V shouldered washers 28 which arerfittedin the outer ends ofsaid arms and close thesame. Nuts 29 are applied to vthe threaded outer-ends of vthe bolts27 andimpinge against the 'washers 28 yas basis of resistance. v- Obviously by tightening thenuts 29 ',on the bolts 27v the j be drawnlaterallyi againstthe arms 22 and 23 both at the top` and bottom thereof and thereby (rigidly.l secured to the j arms 22 and 23 against endwise or angular j Y movements,see Fig. 15.'

f Y Secondary, frame The tilting frames@ isairecuy mounted detail view with'nsome' parts provided for rigidly securing the legs, 26, by

on a secondaryqframe 30'which, in turn, is Y arms 22 inward of theirlegs 26 andjwith its the end members of the frame 21. y

vcarried bythe mainframe 21 andl projects thereabove. This secondary frame 30 is rin the form of jan inverted U `andfitslegs,atr their lower end, are rigidly secured'fto the` Thetransverse member of the secondary i .frame 3()V is made in two sections, fora purpose that will presently appear, one of which is relatively long and the other of which is relatively short. These long andshortsections of the frame 30 overlap, the former above the latter at the right-hand side of said frame, and are 'rigidly but detacha'bly connected by a splice 31, see Figs. 2 and 4.

The long section of the transverse portion of the secondary frame 30 affords a Countershaft 32 about th-e axis of which the tilting frame 2O may be oscillated. L pair of oblique brace rods 33 directly connect the shaft 32 at its outer ends to the arms and thereby rigidly hold the secondary frame against springing movement longitudinally of the main frame 21. Except for the fact that certain parts, as will hereinafter appear, must be applied to the shaft 32 by axial move ment, the U-shaped secondary frame 30 could be made from a single piece of tubing. The advantage of a frame of this type, whichis virtually a one-piece construction due to the rigid splice 31, that its transverseportion, whichis curved into the legs, has a greatdeal more resistance against bending than it would have if it were made of a straight shaft mounted on a pair of legs. In this type of U-shaped frame cross-bracing to hold :its transverse portion against longitudinal shift` ing movement is not necessary. Y

To permit the parts heretofore referredto, to be applied to the countershaft 32 or removed therefrom, the legs ofthe secondary frame 30 and the brace rods 33 arefdetachably secured in position by any suitable means. v

.Tilting i frame The tilting frame 20 includes a pair of lat'- erally spaced tubular guide posts 34, a pair of inn-er cross-tie plates 35, an outer cross-tie bar 36,v and an intermediate cross-tie rod 37. On the inner ends. of the guide posts 34 is a splash plate 34 which has at its center a hole through `which the drill 17 loosely works. The inner cross-tie plates 35 are applied, the one to the face and theother to the .back of the guide posts 34 and rigidly bolted thereto. The outer cross-tie bar 36is, as shown, made of wood having in its Iend portions holes through which the guide posts 34 extend.

The end portions of the cross-tie bar 36 are slit in the plane of the secondaryframe 30 and through the holes forlthe posts 34 and provided, outward of said posts, with handnut-equipped draw bolts 38 by which Athe prongs of said membersmay be frictionally Vclamped onto the posts 34 to rigidly secure the bar 3G thereto indifferent longitudinal adjustments thereon.

Formed in the cross-tie bar 36, at the longitudinal center thereof, is a hole lQhrough .which the drill 17 extends with a working fit, or in other words, the cross-tie bar 36 af-` fords an outer bearing for the drill 17. For

securing the'drill 17 to the tilting frame 20,

Vbushings have on their opposing fac-es hubs Vabout the axes ofA the arms 25.

when not in use or during transportation vof the'machine, there is provided a' hand-pieceequipp'ed set-screw 39 which has 'screw-- threaded engagement with a nut-actingplate 40 secured to the cross-tierbar36 at the back g thereof and which screw is arranged to impinge against the drill 17 and hold the same. As the drill 17Vis fed to its work the crosstie bar 36 may be moved'inward on the guide posts 34. The intermediate cross-tie rod 37, as shown, is a tube rigidly secured b y U-bolts 42, intermediate. of its ends, in half seats in bearings A41 on the posts 34. Thesebearings 41- tend rearward from the posts 34 and'in turn are rigidly secured to said posts `by the U bolts 42. Theqcross-tie rod 37 extends materially outward of the bearings 41 at each side of the posts 34. l 'K As previously stated, the tilting frameQQ f is mounted to turn about the axis of the couny tershaft 32 and this is accomplished by bearings 43 and eccentric bushings 44. `The bearings'extend rearward from thebaclrs ofV the posts 34, intermediate of their ends, and have half seat-s inwhich the eccentric bushings44 y are turnably mounted and held therein U-bolts 45 which in turn secure the bearings 43 to the posts 34. Normally the U-bolts 45 rigidly hold the eccentric bushings 44 from turning in the bearings 43. The shaft 32 extends through the bushings 44v and which 46 through which the shaft 32 also extends concentric thereto. cross-tie `hand bar 47j" connects the two hubs 46 and-by which said hubs may beturned about the axis of the shaft 32 to rotate the bushings 44-onsaid shaft. Thebushings 44 act as a chain tightener for the power transmission mechanism,

as will presently appear,I and t-he arrange- Vment thereof is 'such as ,to impart, when turned, a limited endwise movement to the tilting frame 20 transversely of the shaft 32.

` A pair of oblique brace rods 48are provided for rigidly but adjustably holdingthe f tilting frame 2O in either a vertical or-horizontal position or at any desired angle b etween these two Vextreme positions. These brace rods 48 have on their lower ends open V,spring eyes 49 through which the arms 25 project. `Primarily, the diameter of the eyes 49- is slightly less than the diameter ofthe arms f 25 so that said eyes must be sprung in applying the'sameto said arms and thereby A pre'- vent vibration and Vresulting ,wear between t-he brace rods 43 and thea'rnis 25.. l/Vhile the "spring eyes 49 vhold the brace rods 48 against longitudinal `movement they are free to turn Removable headed pins "50 extend through vertical holes in the armsV 25 outward of the eyes 49 and hold the: eyes 49 against outward axial movement in the arms 25.

The upper end portions of the bracerods 21.30 *l 48 are attached to the intermediate cross-tie rod 37 by asingle cla-mp which comprises a .link 51 that extends longitudinally and completely-through said member with freedom for compound endwise sliding andturning movement. This link 51 has a longitudinal slot 52 through which the brace rods 48 extend outward of the ends of the cross-tie rods 37. A hand-screw 53 has screw-threaded engagement with the right-handend of the link 51. and impinges against thei adjacent brace 'v rod 48 to frictionally press the same against the adjacent end of the cross-tie rod 37 which acts as abase of resistance therefor and causes f .the screw 53 to impart an endwise movement to the link .51 and therebyfrictiona-lly clamp the other bracerod 48onto the respective end of the cross-tie rod 37. It will thus be seen j that by manipulating the single hand-screw the two brace rods 48 are simultaneously ,frictionally clamped onto thek ends of the cross-tie rod 37 or released therefrom.

Y' It is important to note that the tilting -frame supports the drill 17 at the transverse center of the main frame 21 and when the tilting frame 20 is in a vertical position l its lower end portion overlies the' recess.. 24

fao

with the longitudinal axis of the drill 17 in the same vertical plane with the axes of the arms 22.

' Umwege The carriage 19 comprises an upper crossvhead 54, a lowerl cross-headA 55, and a pair of flexible rods 56 which hold said lower cross-head suspended from ther upper crosshead 54 for limited-universal movement inL the plane of said lower cross-head and be- Y tween thetwo cross-tie plates 35. .The rods y 56 extend through alignedholes inthe crossl lsliding movement.

heads 54 and 55 and have nuts applied to their ends outward of said cross-heads. Cushioning springs 57 encircling the rods56 are lcompressed between inner nuts. on said rods and the under side of the upper crosshead 54.; The body ofthe upper cross-head 54 is made of woodand khas holes through which the guide posts 34 extend and said posts vhold this cross-head for straight line The upper cross-head 54 lis made in two parts which separatelongitudinallyV through the postk holes for application to the guide posts 34 bylateral movement toward each ot-her. Metal reinforcing plates-58 are applied to the front and back 'ofthe cross-,head 54 and connected by bolts which'extend through'aligned holes in said pla-tes' and the sections of the upper crosshead` 54 `and rigidly connect said sections and pla-tes. Y

Oarrz'ge reciprocating mechanism The power transmission mechanism for reciprocating the carriage 19 includes a crankshaft 59 and a Vpair of connecting rods .6 0.

The crank-shaft 59 extends transversely of the tilting frame 20, directly back of the two ,cross-tie plates 35, and is journaled in bearings on the guide posts 34. y Thetwo connecting vrods 60' at their upper ends are pivoted on trunnions 61 formedwith to 'said plates bybolts, see Fig. 3. Said connecting rods 60 at their lower ends are pivoted on crank-pins 62, one of which isV secured to a large crank-acting sprocket wheel 63 on the left-hand end of the ycrank-shaft. 59cand the other of rwhich is on a ycounter-weighted crank-arm 64 on the right-hand end of vsaid crank-shaft, see Figs. 1 and 2. f

It is important to note that ythe axesof the ldrill 17, guide posts 34 andtrunnions 61 allv lie inthe same plane and that the connecting rods 60 have a `direct pull and push onthe cross-head-.54 at .each side of the 'guide posts34.V

Y Motor The sprocket wheel 63, which formsa part of the power transmission mechanism,Y is

l76 blocks on the. ends of the upper cross-head 54 v between the plates 58fand are rigidly secured drivenfrom an internal combustion engine',

indicated as anentirety by the numeral 65 with the exception of its crank-shaft 66. and fly wheel 67, and is mounted on the main frame 21 vwith its crank-shaft66-extending transversely thereof. The base of the engine 65 rests on a pair of laterally spaced timbers y68 which extend longitudinally of the main rframe 21 and rest on its end members. Clamping devices 6 9 rigidly hold the engine base on the timbers 68 and rigidly secure said timbers to the end members of the main frame 2 1. It is important to note that the weight of the engine 65 is on the rear end portion of the main frame 21and substantially all of the vibrations thereof areltransmitted to the ground through thev rear leg 26 sothat the. drill mechanism is substantially free lfrom engine vibration. While an internal combustion engine shown for operating the drill it will, of

course, be understood that any suitable motor be employed.

Tran-smz'ssz'onmeeham'sm 73 aligned with the sprocket vwheel 63 and over which sprocket wheels asprocket chain 74 Vruns and completes the power transmisl sion mechanism from the engine 65 to. the carriage 19 with the exception of a belt tightener forthe belt 72. vi Y Belt tz'ghten'er 1 The' tightener for the belt72 isa flanged idle pulley 75 onla crank formed with one end of a shaft 76 journaled vin abearing 77 on the` frame 30. The crank-shaft 76 is adjustably held, 'with the idle pulley 75 in engagement wi th the lower run of the belt -7 2 to Y lanchored at one-end to the ,shaft 76 and at` i tached atits other end to an offset part 82 on the handleverV 78, yieldingly holds said lever interlockedwith the quadrant 79. y This tightener for the'belt 72 also serves as a friction clutch for Ause yin, starting and stopping 275s the drill-operating mechanism while the engine 65 is running. Itjalso prevents breakage ofthe mechanism due to the sudden stickingl of the drill 17. The hand lever 78, which is convenientlylocated and easy to operate, provides simple means for starting and stopping the drill-operating mechanism.

i Referring again to the eccentric bushingsv 44e, which act as a belt tightener, it is evident that by loosening the U-bolts 45 and turning;l said bushings on the shaft 32 and in their half seatfl endwise movement will be imparted tothe tilting frame v20, transversely of the..

countershaft 82, and move the sprocket wheel 73 radially in respect to the sprocket wheel 63iand thereby `tension the sprocket chain t 'mummy far aan In addition to the bearing in the cross-tie bar 36 for the outer end portion ofther drillV 1j7' said drill has Van intermediate or main bearing 83 in the form of a sleeve` in* which said drill works withfreedomfor compound endwise and rotary movements ,This'sleeve bearing83 is turnably mounted in a pairof half seats 84m theopposing faces of the two sections of the upper cross-head 54 and the aXisof said bearing is parallel to the axes of the guide posts 34. On the ends ofthe sleeve bearing 88 are, annular external `fianges 85v lwhich engage the inner and outer faces of the upper cross-head 54 and Vhold said bearing against axial movement in its half seats 84.

The inner cross-head 55 aords a third or inner bearing for the drill 17 and has, at its center, a hole Vthrough which the drill '17 works, see Fig. 3.V `Said inner cross-head 55 Works entirely Within the space betweenthe two cross-tie plates 35, lis out of contact with said pla-tes, and the 'guider posts 34;, and the Vflexible rods 56 permit universal Vshifting movement of the inner cross-head55 1n the plane thereof withthe drillf17`so that there is absolutely no side thrusts on the drill `17 where the same worksthrough said cross` head. While: the upper and intermediate bearings positively Vhold .the ndrill (17 for;V straight line movement the inner bearing or cross-head 55V also serves as a guide for the drill 17v andinaterially assists in carrying the weight-thereof when operating in a horizontal 'i or oblique position.

Means for oyscz'ZZaf/z'ngfmat'n bearing forfclrz'rll.' Y

The bearing sleeve 83 is oscillatedabout its.` i axis in thehalf seats .84, during the reciproca;V

tory movement of the carriage 19 to impart V8.0 i steps of rotarymovem-entto the-drill2i17 duit-f'` j ing its reeiprocatorymovement by f the car-11 lriage 19,- by aradially l:projecting crank-arm` 86, integral withthe inner flange 85, and. a`

tilting link 87 which connects the outer end `of the arm'86 to aXed bracket'88 on'the right-hand gu'ide`-post34:.` The connections between the link 87 VVand arm 86 and bet-.WeenV said link and the'bracket`88 are universal joints 89 and 90,: respectively, whic'lrpermitV saidlink to swing in all directions. f

` p rea-7:50a gia-p 1 1 Afriction grip 91 is applied to the -drill 17 at a point between thecrosseheadst and 55 and throughwhichgrip the drill 17 is. automatically fed to -itswork. This friction grip 91 as'shown, is a U`shap`e`d spring steel plate, havingintheI opposing facesr of Aits leaves longitudinallyl extended half seats which engage the' drill 17 .atdiametr'ically opposite sides, and Va. nut-equipped draw'bolt 92` which extendsthrough a pairof `aligned holes intheleaves of said grip between their outer longitudinal edges andfthehalfseats. invsaid grip. By manipulating the nut on the draw bolt 92 the tension with which the grip 91 engages the drill 17 may be:varied,at will. Y The'square endv ofthe draw bolt` 92- under its head extendsfthroughV a square hole inthe respective leaf'ofthe grip 91V and holdssaid bolt from turningwtherei'nl and afnutlock 93'holds the nut on said boljtfrom turnspring `whichextends transversely ofthe grip" 91, is secured by a'rivet to `the'respec'tve leaf' of the Vgrip 9 1 near the transverseportion thereof, and has near its free end portion av fit square 'hole through which the'fsquare inner'k end of the nut extends, see Fig. 11. Obvious-` ly by pressing lthe spring nut-lock93jinward the same lwill be disengaged fromthe' nut and permit said nut to-be turned on the bolt 92. v

Cooperating withl the friction grip'. 91 isan abutment in the formA of a striker plater94 which. rests on the upper edges of the crosstie plates 35and is securedtosaid 'platesby two pairs `of nut-,equipped,bolts95which'extend along thelouter faces thereof.` These bolts 95 extend through alignediholesin the im. sleeve83 and the friction grip91 isa com- 'strikerplate v94 and duttiirned flangesl96 on thelovverlhorizontal edges of the plates 35. Short cushioning springs 97 encircling the bolts. 95 between theirfnuts and the plates 35, Y prevent'saidlnuts from'workiiig loosev on the boltsj95 underthepounding actionof the grip on the striker plate94.

y y Propelz'ng and'Zmy'erapri/figs i Encircling the drill 17 between the "bearing pression propelling spring 98 and a compressionjbue'r spring 99 encircles the drill 17 ,'betvveen'sai'd grip and the lower cross-head 5 5. rI he spring y98 is vsecuredto the bearing 1 sleeve'83 byha-ving its upper end portion eX- tlievfrictionfgrip 91 and the upper fend of the buler'springg99 is-loose for contact Witl i' Vthe underside of the grip 91 and Works loosely through an `aperture in the strikery plate 94:. It is important to not-ethat when the grip 91 is on the striker plate 911Y there is coni of heavyy retainingV Weights 102 which rest onthearmsb 22 and have vertical holes'103 in ed toA be inserted `intofthetubular arms '25,

. on thearms [22.1. y

siderable `clearance between the grip91 an theladj acent end of the spring 98, see Fig; 3.

The purpose of this clearance Will presently y ,y weights :The front legs 26 areheldfonfthe ground during the operation of the drill 17 by a pair Which.` the uppery end portions of said legs extend and detachably hold `.the,.vveightsr102 d' transport truclrfor the drilling machine includes a pair. of tire-equipped Y Wheels 104 journaledjon ,crank-like stub axles 10,5.ada'ptand Vdeta'chably secured thereto byA the pins which j' extend through `transverse holes Yiii-.said axles. In 5,7the, Wheels 10.4 are shown inoperative positions by means of'full, lines and in inoperative positions by means.

ofg-broken-'lines By"l reference to Fig. 16

itY Willbe notedthat theustub axle 105 is provided VWithtvvo holesf90 apart to 'receive the pin 50and hold Ythe Wheels 104, as shownv ineither of tWo positions indicated by full and broken lines in Fig. 5'. If necessary the legs26fmay be raised during the. transport s tation of the drilling machine.

" Uuph'ng 't i coupling 106,A asshown lin Fig. .5,zis, se#v curedl to the outer endV ofthe drill 17as a means forv attaching Vthe vdrilling machine to .anautomobile forother .vehicle 4tobe draWn 'legs 26 extending linto, the holes 103 to hold thereby as a trail'erl "At-this time the drill 17 of-'course,-;vvill be` rigidly VVsecured tothe cross-tie bar 36by the screWBvQ.y f i VSemangas@:of angling mama-7,

u It may be `assumed 'that themachine''hasV been moved on its transport truck toa quarry.

or other place Where ,a hole isf-tobe drilled andthat the tilting frame20'is in a horizontal position held bythe brace rods 48 and that the drill 17 islocked to said frame by the hand-screwV 3'9,alllasv shown inVV Fig. 5f While the drilling machine is vbeing dravvn` asa trailer by 'an automobile'or o-thervehicle;

the coupling 1'06holdsthfe same balanced on;

its Wheels With the legs 26 out'.ofpcontactrjv With the ground; Y

In settingup the drilling machine toY drill a hole thecoupling 106 isremoved from the "drill 17 and the machine moved.' on its Wheels 104,. by' hand, Yto a position in which Vthe transverse Acenter of the lrecess `24C `is kover Vthe point VWhere the hole isfbeing drilled.

and the faires. of the arms 22 aligned with, Y*

released, after being moved by hand, it Will be supported on the two front legs 26 and.. d the Wheels 104:( Therear leg 26 is irst ad;y

justed onto the groundy and if necessary one or both of the front legs 26 adjusted to levell up the frame 21. The transport truckis'the'n either removed from the' arms 25er adjusted;` into an inoperative position,`V as shown broken lines in Fig. 5.

. Next the hand-screvsTr 53 operated*"tore-- lease'the tiltingframe 20 from the brace rods and again rigidly secured tov said rods l by tightening the hand-,screwv 53'. The friction grip 91 is next releasedV by loosening'itsdraw 118 and said frame turned to a verticalposi-` tion, vWhen a vertical hole is to be drilled,

Y bolt 92 andthe handfscrevv v39 ope-rated to release the drill 17 and Vpermit the same tov lslide by gravity lthrough'the bearing inl the cross-tie bar` 36,v the `sleeve'bearing 83,` ythe 11.0

bearing in the lower `crossfhead 55 and the gripf91 l to bring thej cuttingr tool 18 fonte the rock. Ify the cutter'18'isy not'quite at the right pointwhere ythe hole is to be drilled thefmachinemaybe .easily shifted to properly position theA same. Y The retainingV Weightsx102 may at ,thisv time be placed on y the arms 22With the upper ends ofthe frontthe Weights in place.`

The hand lever 78y v y 11.20 is next manipulated to` move the belt tightener into. an inoperative position to release. the tension on the belt. 72.

Y and perinitthe pulley 71 to be turned by hand to operate the crank-shaft59 and position `the carriage 19 its 'lowermostposition In this-position of the 'carriage`19 the cranks' ofthe shaft 59 are in their lowermost position Y and 'the propelling spring98; andthe bufferr spring 99 are extended to'their fulllength saidV point. l/.Vlienv thejadrilling 'machine insg?! i the carriage 19 'has also caused the link 87 .to

fas

' sired tension.

with the upper end of said buifer spring below the upper face ofthe striker plate 94. Also at this time the friction grip 91, which is loose on the drill 17 restson the-striker plate 94 and when in this position its drawbolt 92 is tightened to frictionally clamp said grip onto the drill 17 with suiicient pressure` also important to note,by reference-to Fig. 2,

that the link 87 is holding the crank-arm '86 with the sleeve bearing 83 oscillated into its eXtreme left-hand position. vByfturning the pulley 71 by hand sufficiently to' give the crank-shaft 59 a further turn of 180 the car riage 19 will bemoved to its uppermost positiony vand theLA buffer 'spring "99 projected through theopening in the striker plate 94.

n This' projecting movement of the buffer spring 99 will lift the grip 91 which,in turn,`

lifts the drill 17 and carries its .cutter 18 above the rocln This upward movement `of rotate the sleeve bearing 83, on the'drill 17 and inthe Vupper crossfhead 54, into its`eX- n.

` riage 19 the link 87, acting through the/cranktreme ri ght-hand position,see Fig. 1.

Finally the engine is'started andthere. after the drill 17 is caused to be reciprocated by manipulating the handy lever7 8 tomove the belt `tightener 7,5in'to engagement `with the belt' 72 and place the'same'under the Vde- Og/@Ze of operation Y At the start the carriage 19 is in its lowermost position withthe cutting tool18 resting on the rock, the grip 91 is in engagement with the striker plate 94 and the compression springs 98 andj99 are expanded to their'fulllength. rlhe revolving crank-shaft 59 moves the carriage 19 upward and gives the drill 17 a powerful 'throw upward through theme-ry dium -of-the buffer spring 99,'-acting on the spring V98 which causes the drill 17 to attain y a high velocity. At or practically at the end of the downward stroke-of the drill 17 the grip 91 is brought to a stopby its engagement with the striker plate 94 and as the drill `17 advances into the rockit drives itself through the grip 91 by the force of its momentum;

` :This automatic' Vfeeding of the drill 17 through the grip 91 takes place ina series lof* almost imperceptiblesteps i s Rotation of the drill Y d y During the upward travel of the carriage -l9th`e' link 87 acting `on the crank-.arm `86, turns the sleeve bearing 83 to the left without rotatingrthe drill 17 for the reason that 1 the spring 98 is out of engagement with: the grip 91 or, in other words, fthe connection, to wit: the frictional engagement between 'the propelling spring 98` and gripf9l, is broken.'

' After the carriage 19 has'reached the limit f of its upward travel4 the momentum ofthe drill 17'causes Vsaid drill to moveinrespect to the carriage 19 which bringsthe grip 91f into "contact with the lowerend of the propelling spring 98 sothat bythe time the drill 17 has reached the limit of its upward travel saidspring has been compressed Itov such van extent asfto cause suficient friction between'the` grip 91 and the inner. end ofthe propelling spring n 98 so as tov cause thedrill 17 tobe rotated with the propelling spring 98 as the carriage 19 is travelling downward, :as will nowl apa pear. Obviously the grip 91 and inner end of the propelling spring 98 ai'ord a small,

arm 186, turns the sleeve bearing 83 in'the cross-head y54 and causes'thespring 985t'o turn about its aXisfand byl its frictional `enji gagement Vwith the grip 91 turns the same,f

and hence, imparts a step of rotary movement to the drill 17 L It will thus be seen that while the sleeve bearing 83 is given one complete `oscillation duringeach cycle of operation of the drill 17 the action thereof is negative'during the upward travel of the carriage 19 and positiveduring 'the `downward travel of the carriage 19 sotha-t'saiddrillisgiven steps'V of 'i rotary movement in a constant direction.. The purpose of turning va Vdrill during drilling-,operation is too well-knownto1 need anyV ycomment here. u

propelling spring' 98 and the grip 91for.`

above u mentioned 'frictransmitting steps of rotaryvnmovement to the i drill, there is a frictional contact on the side of the spring 98 when compressed,.which ma-` terially assists in `turning `the drill 17 with of the drill 17, caused by the buckling action Y the propelling spring 98.` As the upper lend ofthe propelling spring 98 is positively conne'cted to the sleeve bearing 83, and hence,

said spring is positively rotated by said bearing without'relying on' frictional'engage-l the friction produced by the bucklingaction of the spring98 it is not absolutelynecessary.

ist

i to" the 'successful 'Workingf the machinev but tal drilling.

it gives a more positive rotation to the Y'drill 17 under diiicult conditionssuch asihorizon- VAs `previously stated, there is a certain amount Vof clearance or free play betiveenlthe grip 91 and inner end of the propelling spring 98, and hence, betweenfthe two springs 98 and 99, thefobject ef Which is to permit the drill 1'7to be thrown upward asimilardistance,

thus causing the drill 1-7 te travel a longer stroke thanc'the stroke of the gcarriages19;

Thiscpermits. the carriage 19, which vtravels at arrelatively slower velocity than the drill 17 p on its downwardV strokaztoreach the lower.. limit off its stroke .at `about thesame time that the drill 17-does-1gf it Were not forthis the drill17fWouldpovertake the carriage 19 and theforce .of its-momentum would be abf sorbed` by the lower or buffer spring 1,99 inf steadof it being impartedto the drill 1i! forv This timingcof the cuttingaway the rock. drillt17 with relation to the' carriage 19, so

thatthey Willreach theidownvvard limit fof their strokes at 'about .the same time, can be accurately gauged by the amount of clearance or-*free play bet-Ween thegrip 91 and compression springs 98 and199. j v

thekv engine 65 is` mounted on the rear end of the fra1ne21 yso "that vibrations thereof are transmitted .to the n groundfthrough the rearlegu26 Without'af-jv fe'cting the` drilling mechanism and the;-

3 AS heretofore statedr vWeight-of--said engine securely holds the rear legon the ground and thef'rear end portion of the frame21 steady. 'Y

` 'l`he secondary framefSO ksupports-the kentire load of the drilland the tilting frame 2O.V fromthe frame 21 close tothe; front legs V26V and indirect line betvveenj'theraxes of said legs, thus relieving the frame 21 froma great deal of the'load7 aswell as shocks and vibra# tionsyvvhichhpermit the use'of a Vrelatively lightframe that affords a rigid-and firmsupe-r port for the parts carrying the drill 17.`Vvl

, 'l' Byturnably mounting the sleeve v'in the c cross-headso that it Will turn With' the drill '17 V duringr its rotation, and in the novel mounting of the carriage 19 andthe application of power-thereto Vfor oscillating the same aswell las Ythe novel mounting or the .drill 17 on the carriage,fthe rdrill 17 has very K little frictional resistance thus permitting the compound reciprocatory and rotary Y movements to be free and easy. rlhis mount-V ing of the drill 17 also makes theV frictional n contact' between the grip 91 and propelling 'and the. sleeve bearingr83 and freely turns ing the other stroke of said cycle.

'boul the @nach analgfip Vwhich at ingame are moving' at a` high velocity. v The cross-head 54 being of Wood and when lubricated freely slides on the guide posts 34 therein with little lfrictional resistance-and Wear. Y

what 1.01am is: i

1. In a device yof the class described, a frame, a carnage mounted to reciprocate on the frame,a bearing mounted to'turn on the carriage, means actuated byl the ,carriage for Y turning the bearing, adrill mounted to recipe rocate endwise in -thebearing with `freedom forl the bearingto turn thereon, a vgrip fric- Ationally held on the drill,y an abutment onl the framefwith which the grip engages durf andmeanscdactingvvith'the bearing. and theA grip for turning the. drillwith the'bearing.

Y 2.111 a dev-iceof the'class described, a frame, p Y

ing the operative stroke of thedrill,to'causefV ythe drill to feedindependentlyof the grip, 85,

carriage mounted to rreciprocate on the frame, a bearing mounted to oscillate on the carriage, means actuated by, the carriage for turning thevbearing, i al drill mounted Yto reciprocate Aendtviseinthe bearing With free` dem for the bearing to turn'thereon, Ya grip fr ictionally held Von. the-drill, van abutment on the framewith Whichthe grip engages `during the'operatlve strolreof the Vdrillnto cause the drill to feedU independently ofthe grip,l andmeans co-acting With the bearing and the grip forl intermittently turning the drilli with the bearing in 'a constant; direction. y

3. In afgfdeviceof'itheclass described, a

frame, a carriagefmounted to reciprocate onfV` the frame, a"bearingmountedY to turn,k on the carriage, means actuated by the carriage for turning thebearing, adrill mounted to recip- Y recate endwise in *theV bear-ing .With freedom for the bearing to 'turn thereon,a grip fric` tionally heldion the drill, an abutment on the frame Withfwhich the grip engages during the operative stroke of the drill to cause-the drill to feedindependentlyof the grip, and

ment of the drill' in the bearing duringone stroke in each cycle of operation of the drill Y to *connect the grip to the bearing and'turn Y Vspring meansplacedunder tension between the bearing and-grip by the endWise movethegnp and uit anuwial the tearngdur--V ln adevice of the "f class described, 'ai frame, a carriage mounted to reciprocateon the frame, a bearing mounted to turn on the carriage and havingav crank-arm, means con# f necting the crank-armto the frame rwhereby thereciprocating carriage will y,o'scill'ate the Y i bea-ring therein, a drill mounted to recipro-V cate vendvvise in thebearing with freedom f or the bea-ring to'turn thereon, a grip' fric! tionally held on the drill, anabutmenton the ,framerwithwhich the grip engages during:

theoperativestrole of the drill to cause the 1'30 y drill to feed independently Vof the grip, and

means co-acting with the bearing and the grip for intermittently turning the drill with the bearing in aconstant direction.

5. The structure defined in claim 3 in which the spring meansis a coiled spring encircling the drill between the bearing and grip with one of its endsA secured to the bearing for movement therewith` Y n 6. p The structure defined in claim 3 in which the spring means isa coiled spring encircling the drill between the bearing and grip with one of its ends secured to the bearing for l:movement therewith, normally there is free play between the spring and the grip.

7'; In a device of the class-described, a

frame, a carriage comprising connected vinner and outer cross-heads, the lat-ter of which is mounted to reciprocate on therframe, a drill mounted in bearings on the cross-heads to reciprocate endwise, the inner cross-head being mounted for bodily shiftingmovement with respect to the outer cross-head-to ermit a limited movement ofthe drilltherewith in all directionstransversely thereof, a grip frictionally held on the drill, and an abutment on the frame with'whioh the grip engages during the operative stroke ofthe drill -to cause the drill to feed independently lofthe grip.

8. The structure defined in claim 7 which.

:further includes a bearing for the drill on the frame` outward of the carriage.

9. In a device of the class, described, a frame, a carriage comprising an outer crosshead mounted to reciprocate on the frame, an

inner cross-head and flexible meansconnect` ing theI inner cross-head to the outer crosshead with freedom for alimited bodily movement transversely of the frame', avdrill mounted in bearings in the two crossheads, a grip Africtionallyl held on thedrilLfand an abutment on the frame withl which Vthe grip en'- gages duringthe operative stroke of the drill tocause the drill to feed independently of the grip.. f

10. In a device of the class described,.a

frame including a pair of laterally spaced cross-tie platesV on its inner end portion, a car-l riagecomprising an outer cross-head mounted to reciprocate on the frame, an innercrosscross-tie members, andy a grip frictionallyl held on the drill .between the outercross-head and abutment forengagement with the abutment during the operative stroke ofthe drill to cause the .drill to. feed independently of the grip. i I

j A11,1111- a-dviee of the use described, Ja mainframe5 an inverted ,U-shaped" secondary -lframef thelegs Aof which: aresecuredlto the main frame, the transverse portion of L the Y secondary-.frame-beingjtransversely divided with the-'members thereofin overlappingai'i'- ,rangeinenh` a clamp yrigidly' 'l connecting the,

members of the secondary frame, atilting frame mounted o'n the transverse portion-'of thesecond'ary frame to-turn about the axis thereof,"and ,avjdrill "mounted on the tilting frame. f'

:mainframe,"'asecondaryframe onthe main i .80 f .alignedec'centricsmounted on the secondary" 'i `frame to: turn aboutA al horizontal aX1s,-,-sai`d; Y `tilting frame having 1avp'air of\bear1ngs.1ink

frame,;;a tilting frame; a-Qpair Aofi. -aiiially which vthe eccentrics Vare turnably mounted but normally Vrigidly securedthereto,I va carframe,a drill mounted on thecarriage, and

.means for reciprocating,thecarriageincluding a crank-shaftion 'the tilting. frame, con.- nectin'g rods from the3crankl.shaftv` tol-fthe carriage and pairfofialigned .wheels anda 9.5 riage mountedto recil'orocate onvtheztilting belt arrangedV -to ,run over 4thef same',V vonef'cfzf. said wheels beinggon Athe crank-shaft? and 'the other of which is onithe .secondaryfraniein aXi-al jalignmentvvith".thel eccentrics, -fsaid 'eccentrics .when turned in the bearing, impart an endwisemovementitozthe "tilting iframe andact as atightenerfor the belt.- l,

13. In: ajdevice of ,the` classI described, a main 'frame comprising a pair of side members 4and front .grearcros's-tie end, members, l

.said-Side membersibeing' extended forwardly of the.frontendrmember and thenlaterallyl .I v outwardly intoaxialyalignment toafford `a Y f i Y each of the' arms, and'aprear leg onthe rear` endmember substantiallyhat the transverse g "center of the main-"frame, an inverted U- "shaped seconda-ry frame, thejlegs offwhich .are securedjto the 'arms l0f the mainfframe,] l1 0 atilting frame mounted, on the,secondaryv frame to `turn about theaxis of its transverse:

portion, and obliquebracerods pivoted at*` I their lower yends on the rear end member and adjustably'secured at their upper end portions to the tilting frame, a Vdrill mounted' on the tilting frame.

frame on opposite sides of therdrill7 ay grip frictionally` held on the drill outwardly ofV f z.V 1

Irlf2s' f the abutment for engagement withsaidabut- In a deviceof thevv class described, a f frame, areciprocatory carriagefmounted on Y 'the frame, adrill mounted on the carriage for relativelyV endwise reciprocatory move-p.E i ment, an yabutment .rigidly securedito the fren j ment at or near the endof the operative4`v` strokeV ofv the drill, 'a bunderV compression spring `and a propelling Vcompression"springl encircling the drill, the former, inwardly of the grip-fand the latter outwardly thereof, the

i "10 n I i f 1581383368U Y- buerflspring'andthe propelling springeni: Y "gaginggthe:carriage asfa'b'ase of resistance 'and alternately compressed by the grip durying reoiprocatory movement of tlledrllv with I n ''vrespet to the carriage,and automat-ie means i n v forturning the drill. L f.

. 15.7 In avdevice of the class described, a y 'fra1'ne,a carriage mounted torecprocate on f i theQframe, a drill mounted toreciprooate end'- Wiseon the carriage, anV ablltmentl secured to 1- A theframe on oppositefsides ofthe drillfand intermediate Vof the ends thereof, a Y grip Y vfrictimally held; onfthefdrill-outwardlyof theabutment.forengagementwithsaid ,abut-'J i .mentaator;Iieavtheend of fthe operative x 'i strokefof'the'dr'illand permitting-` the jrdrll Y f Yto,feed'.independentlythereof,a buiferoom- ."press'ion'lspringfand'Ia''propellingYcompres y i sion .SpriIIgenCirGling the. drill,L the former v i 'a 20 inwardly of.the,gripgand'thelatter outwar'dly thereof, the 'buffer-spring: and'v the s* f propell'nggspring engagingthe 'carriage-as a2 y )base of resistance and'alternatelycompressed v, n bythe carriagezigripdurng,reciproeatory ymovenfientfof thecarriage,the'buerspring f;

when Compressed being operative on'the drill.

l -vjdnringreturn movement voifthe carriage to Y moveftheV drillfat: agreater speed than that' i Y ofthe carriage to thereby compress the pro# i Y '30 lpeilingspring Vwhichl oonseeplently, during thefo'rward movement of thelcarriageV and a operative'strokerof thedr'll, moves'thedrill Y at la greater speed than vthai:- ofthe carriage, I and .-i'n; which*l devioethe. propelling spring i 1 v Y i' V35 'isi attfaehedto the carriage for 'reeiproeatory .A j 14155 Y -flo .movementltherewith'fan'dfthere"is normally *'ilee playbetweenxthe"grip 'aindg'rthe"'propel 

